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Commitments, Contingencies and Guarantees (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2024 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
Contractual obligation | $ 2,500
Other liabilities reserve | $ 92
Loss emergence period | 1 year

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- Definition Loss Contingency, Loss Emergence Period + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Other Liabilities Reserve + References No definition available. + Details
Name: | slm_OtherLiabilitiesReserve
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Amount of contractual obligation, including, but not limited to, long-term debt, lease obligation, purchase obligation, and other commitments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3 + Details
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Balance Type: | credit
Period Type: | instant